#coding: utf-8

def main():
    M,N = map(int, input().split(' '))    
    print(slap(M,N))


def slap(M,N):
    for _ in range(1,N+1):
        M = (M*2)/3 + (M+1)/3 + 0/3
    return M 


if __name__ == '__main__':
    main()